diff options
| author | Jan Kara <jack@suse.cz> | 2017-06-13 16:20:25 +0200 |
|---|---|---|
| committer | Moyster <oysterized@gmail.com> | 2017-11-06 15:33:14 +0100 |
| commit | 3a4eabacd4a7a1e8531e683f7e94ea04d9a6cd0f (patch) | |
| tree | 11f13b382ee46bc8878eb0227156c7f1db9a5aa6 /include/linux/rmap.h | |
| parent | 7b94f578bd1823895ccc44785a885c191d362b34 (diff) | |
udf: Fix deadlock between writeback and udf_setsize()
commit f2e95355891153f66d4156bf3a142c6489cd78c6 upstream.
udf_setsize() called truncate_setsize() with i_data_sem held. Thus
truncate_pagecache() called from truncate_setsize() could lock a page
under i_data_sem which can deadlock as page lock ranks below
i_data_sem - e. g. writeback can hold page lock and try to acquire
i_data_sem to map a block.
Fix the problem by moving truncate_setsize() calls from under
i_data_sem. It is safe for us to change i_size without holding
i_data_sem as all the places that depend on i_size being stable already
hold inode_lock.
CC: stable@vger.kernel.org
Fixes: 7e49b6f2480cb9a9e7322a91592e56a5c85361f5
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Diffstat (limited to 'include/linux/rmap.h')
0 files changed, 0 insertions, 0 deletions